William pitt hoffman



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. WILLIAM VPITT HOFFMAN, OF SAN FRANCISCO, I CALIFORNIA. Letters Patent No. 68,076, dated August 27,-1867.

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To ALL WHOM IT MAY OONOERN;

' Be it knowntha-t I, VILLIAM PITT HOFFMAN, of Stm Francisco, county of San Francisco, State of Caltforniu, have invented a new' und improved Window-Blind and Anti-Duster for railway cars' and dwellings; and I do hereby declare thefollowing description varid accompanying drawings are sufficient to enable any person skilled in .the urt or science to which itfmost nearly appertuins to make and use my said invention or improve-A 'lhe object of my invention isto provide an improved window-blind and anti-duster transparent or-op'nquebut which, while allowing free access to the ail', will ei'ectually-prcvent the passageof all dust, n-nd-isespecially' adapted to be used on railroad ears. To effect my object Iprovide windowlfrme of any suitable construction, and having the space ordinarily occupied by platin glnuihg filled with V-shaped troughs, extending from side to side, and purtiallyilled with weten-supplied from above sous to intercept and absorb the dust, while the air is allowed to enter the our or building,4 water. Tomore fully explain and illustrate my invention, referen I forming a part of this specification, of which-` Figure 1 is a front view of the blind.

`Figure 2, a side sectional elevation, taken through :v x, fig. Il.

Figure 3 is uperspective view ofl one trough,'showing a partition.

Similar letters indicate like parts in euch of the drawings..

` A is u window-frame, which may be constructed of wood in the ordinary way. extending across the interior space of the frame, and so placed that thenpex of each distance down into the trough below. These troughs ure higher en the inside c than the outside d, so thati'tho water with which they are to be supplied shall never llow overnnd wet Vthem on that side. The water may be brought'to the upper trough by a flexible or telescopic tube, F, passing through the pipe E und conveyed away from the lower onein the same manner through the pipe G, the object of the blind t'o be raised or lowered when desired. Through the front o1' outside of en'ch troug or more small holes, a a, at such a height as to allow the surplus water from each trough to lower one, and ut the sume time to wash olf the dust which may collect on the surface. slightly concave, so that as the dust strikes against the fece, it will be thrown dowuw absorbed, while the air passes through the space between the bottom of the trough and in the oncbelow, entirely freed from dust, and cooled by its contact with the water. changed in each trough, running at last into the lower one, C, from which it is conveye opening g, shown in iig. 2. b 6 are partitions across each trough, to prevent the water from all running to one end in ascending or descendinga grade, end may be one or more to each trough, as may be found necessary. D D are rubberor other-linings to the insid'eof each frame, against which the en ds of the troughs are pressed sufficiently hard to ma'ke them water-tight. The troughs ure intended to be made of glass -for transparent windows, or they maybe made o'peque for shades, and of any suite-ble material. l

VHaving thus described my invention, what I claim, und desire to secu 4re by Letters Patent, is vThe window-blind `and anti-duster, composed of frame A, V-shaped troughs B B, with straight or concave which may be ,either B B are V-shaped troughs, trough extends a sucient run intothe next This front is also made ard into the water and the surface of the water The water is constantly d away through G by the sides, und having the openings a a, the partitionsb b, and tubes E G, the latter for the purpos emptying the troughs, substantially as and for the purpose set forth In witness whereof I have hereunto set my'hand and seal.

WM. P. HOFFMAN'. [Lust]- Witnesses:

H. P. LATHROP, C. W. SMITH.I

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